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    <title>ShellCheck: SC1116 – Missing `$` on a `$((..))` expression? (or use `( (` for arrays).</title>
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    <h1>SC1116 – ShellCheck Wiki</h1>
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    <h2 id="missing--on-a--expression-or-use---for-arrays">Missing
<code>$</code> on a <code>$((..))</code> expression? (or use
<code>( (</code> for arrays).</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC1116.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="va">var</span><span class="op">=</span><span class="va">(</span><span class="er">(</span>foo+1<span class="va">)</span><span class="er">)</span></span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC1116.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="va">var</span><span class="op">=</span><span class="va">$((foo</span><span class="op">+</span><span class="dv">1</span><span class="va">))</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p>You appear to be missing the <code>$</code> on an assignment from an
arithmetic expression <code>var=$((..))</code> .</p>
<p>Without the <code>$</code>, this is an array expression which is
either nested (ksh) or invalid (bash).</p>
<h3 id="exceptions">Exceptions:</h3>
<p>If you are trying to define a multidimensional Ksh array, add spaces
between the <code>( (</code> to clarify:</p>
<pre><code>var=( (1 2 3) (4 5 6) )</code></pre>
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